Enclosure structure system for deep foundation pit engineering and construction method thereof

By integrating the retaining structure system, combining HC composite pile wall, enlarged bottom inclined bracing pile and water-stop ring, the problem of insufficient coordination of HC method piles in deep foundation pit engineering is solved, achieving efficient and safe soil stability and deformation control, and is suitable for deep foundation pit support in complex urban environments.

CN121719243APending Publication Date: 2026-03-24CHINA CONSTR THIRD ENG BUREAU GRP (ZHEJIANG) CO LTD
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Patent Information

Application Number
CN202512029056.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-12-30
Publication Date
2026-03-24

AI Technical Summary

Technical Problem

In existing deep foundation pit projects, the continuous water-stopping and bending resistance characteristics of HC method piles and the axial pressure transmission advantages of inclined bracing piles have not been effectively integrated, resulting in insufficient coordination of the retaining structure. It is difficult to balance economy, construction efficiency and deformation control accuracy, especially in complex urban environments where comprehensive needs cannot be met.

Method used

A combination of vertical water-cutting support units, inclined bottom expansion support units, and permanent replacement support transition units is adopted to form an integrated retaining system, including continuous HC composite pile walls, inclined bottom expansion support piles, and water-stop wing rings and replacement support plates. Through high-strength cast steel hinged supports and corbels, the axial transfer of loads and permanent force conversion are realized.

Benefits of technology

It significantly improved construction efficiency and safety, reduced material costs and construction period, ensured soil stability and deformation control, protected adjacent buildings and underground facilities, and met the requirements of green construction.

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Abstract

The invention provides an enclosure structure system for deep foundation pit engineering and a construction method of the enclosure structure system. The system comprises a vertical water interception supporting unit, an inclined bottom expanding supporting unit and a permanent support changing transition unit which cooperatively form an integrated structure. The vertical water interception supporting unit is an HC combined pile wall, the inclined bottom-expanding supporting unit is a bottom-expanding inclined supporting pile with a bell-jar-shaped expanding head, and the permanent support changing transition unit comprises a water stop wing ring and a support changing plate strip. During construction, the HC combined pile wall is firstly constructed, then the expanded-base diagonal bracing piles are arranged, and finally load conversion is achieved through the water stop wing rings and the support changing plate strips. Through an integrated structure combination and a systematized construction process, collaborative operation of vertical water interception supporting, inclined bottom expanding supporting and permanent supporting changing conversion is achieved, and the problems that in the prior art, a supporting system is complex, the collaboration is poor, passive area reinforcement is poor, and the integrity of the system is insufficient are solved; the method is suitable for construction projects such as high-rise building basements, underground comprehensive pipe galleries, large underground parking lots and commercial spaces.
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